Well If you can find them, I suggest Federal .410 Handgun 000 buck. They're way better than regular 000 buck shotgun shells. They also make #4 shot handgun, but the 000...whew...what it does to a target makes me so happy. I recommend shooting at water filled milk jugs. I love shooting the 45LC also. I buy my federal 000 handgun shells at Wal-Mart when they have them in stock, they'll run you about $13 for a box of 20.
God and guns make this country strong.